ABSTRACT: This paper discusses five errors and misunderstandings in the application of competition law which are particularly relevant from the perspective of an economist: 1) The notion that economists and lawyers do not mix well; 2) The notion that economists should not (but often do) disagree; 3) The (ab)use of empirical evidence; 4) The (un)importance of tacit collusion; 5) The vertical restraints conundrum.